M65850FP データシートの表示（PDF） - Renesas Electronics

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M65850FP

Digital Echo (Digital Delay)

Renesas Electronics 

M65850P/FP

3. Input/output LPF

It is necessary to change the LPF setting (signal pass band, fsig) of digital echo according to the clock frequency.

(Refer to the table below)

LPF1

REF

LPF2

REF

+

–

*

1

* (FP: 2)

C2

*

2

* (FP: 3)

R2

R1

R1

C1

+

–

*

9

* (FP: 10)

C2

*

8

* (FP: 9)

R2

R1

R1

C1

1

∴ fsig =

2π C1 • C2 • R1 • R2

Delay Time

(ms)

15 to 30

Clock

Frequency (Hz)

11.0 M to 5.5 M

Signal Pass

Band (Hz)

7k

R1 (Ω)

15 k

31 to 100 5.3 M to 1.64 M

5k

13 k

101 to 200 1.62 M to 800 k

3k

16 k

(VCC = 5 V, Vi = 100mVrms, f = 1 kHz, Ta = 25°C)

LPF

Distortion

R2 (Ω)

C1 (F)

C2 (F)

(Reference Value)

(%)

15 k

3300 p

680 p

0.2%

(Td = 20 ms)

13 k

4700 p 1000 p

0.3%

(Td = 50 ms)

16 k

6800 p 1500 p

1.2%

(Td = 160 ms)

4. Mute

When power is turned on, the mute function works automatically to prevent noise generation.

(Here, however, “mute” means the function which prevents noise generation after the reset time.)

Power on

time

Reset

period

Mute period

(about 260 ms)

Mute off

time

When power is ON (fck = 1 MHz)

REJ03F0171-0201 Rev.2.01 Jan 25, 2008

Page 6 of 11

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